exam Maths Puzzle Numerical Ability

I messed up the question

3a^2+15a
________
2^3-25a

Can you help me solve this
Thank you

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exam Other Question

find the coordinates of the midpoint of a segment with the given endpoints:
A (0,0), B (-8,6)
Find the vertex, the line of symmetry and the max/minimum value of f(x). Graph the function.

I have worked some of these successfully but am confused with the way this problem